Grand Coulee to Seattle is 228 miles and takes about 4 hours 35 minutes via I 90 and Coulee Corridor, with a fuel budget near $48 and enough daylight to finish in a day. This trip stays within Washington State, moving from the Pacific Coast region towards the Pacific Coast region. Expect a mostly highway drive that's straightforward and efficient for getting from point A to point B. It's a good option if you need to cover ground without extensive planning, fitting comfortably into a single day.
Trip Pace
Same-day drive is realistic
A same-day return is possible, but it will make for a full day on the road.
Break Rhythm
1 planned break
Plan on a short reset every 3 to 4 hours to stay fresh behind the wheel.
Midpoint
114 miles from Grand Coulee, WA
A natural place for your longest stop of the day
, about 2h 27m into the drive
.
Main Roads
Road
Distance
Duration
I 90
148.8 mi
2h 44m
Coulee Boulevard
25.1 mi
32m
Coulee Corridor
21.3 mi
29m
Basin Street Southwest
19.9 mi
26m
Coulee Corridor / Sunset Highway
4.3 mi
6m
WA 28
3.7 mi
5m
Alder Street Northwest
1.6 mi
2m
Grand Coulee Avenue
0.5 mi
<1m
Longest stretch:
I 90
— 148.8 mi, about 2h 44m
Traffic on I-90
Hour-of-day weekday pattern from 83 FHWA count stations on your route.
Peak
4 PM
~2,625 veh/hr typical
· worst 3,290
Quietest
2 AM
~134 veh/hr
Peak-to-quiet ratio
19.6×
busier at peak than in the quiet hours
12a6anoon6p11p
Averaged across 52 weeks of 2023 FHWA Travel Monitoring Analysis System data. Weekday hours only (Mon–Fri).
Turn-by-Turn Driving Directions
Step-by-step road directions between Grand Coulee, WA and Seattle, WA.
1
Start on Spokane Way
142 ft·5 sec·Spokane Way
2
Turn right onto Main Street
163 ft·5 sec·Main Street
3
Turn left onto WA 155
0.3 mi·44 sec·Midway Avenue
4
Continue on WA 155
257 ft·7 sec·Midway Avenue
5
Continue on WA 155
0.5 mi·56 sec·Grand Coulee Avenue
6
Continue on WA 155
25 mi·32 min·Coulee Boulevard
7
Continue on US 2
4.3 mi·6 min·Coulee Corridor / Sunset Highway
8
Turn left onto WA 17
21 mi·29 min·Coulee Corridor
9
Turn right onto WA 28
3.7 mi·5 min·WA 28
10
Turn left onto Alder Street Northwest
1.6 mi·2 min·Alder Street Northwest
11
Continue on Alder Street Southwest
0.4 mi·56 sec·Alder Street Southwest
12
Turn right onto 5th Avenue Southwest
392 ft·16 sec·5th Avenue Southwest
13
Turn left onto WA 28
20 mi·26 min·Basin Street Southwest
14
Take the ramp
0.3 mi·44 sec
Toward I 90 West: Seattle
15
Merge onto I 90
149 mi·2 hr 44 min·I 90
Use the straight / slight right lanes.
16
Take the exit
0.7 mi·1 min
Exit 2CToward I 5 North: Vancouver British Columbia, James Street, Madison StreetUse the straight / slight right lanes.
17
Keep slight left at fork
0.2 mi·21 sec
Toward I 5 North: Vancouver British Columbia, Madison Street, Convention Center
18
Keep slight right at fork
0.3 mi·54 sec
Toward Madison Street, Convention PlaceUse the slight right lane.
19
Turn left onto Madison Street
0.1 mi·35 sec·Madison Street
Use the left / straight lanes.
20
Turn left
31 ft·2 sec
21
Arrive at destination
Trip Plan
Leaving Grand Coulee in the morning is your best bet, giving you ample daylight to reach Seattle. With a 4-hour 35-minute drive time, you only need one planned stop, so you can be flexible with timing. Keep an eye on your fuel, especially before departing Grand Coulee, as the longest stretch without major towns could be up to 148.8 miles on I 90. This route is manageable in a single day, so you won't need to worry about an overnight stay unless you prefer a more leisurely pace.
Morning Departure
An early start around 7-8 AM gets you there with plenty of daylight left.
Evening Departure
A late afternoon start means arriving after dark. Morning is better.
You can normally do this drive in one day.
Plan roughly 1 meaningful break for fuel, food, and rest.
The halfway point lands around 114 miles from Grand Coulee, WA, or about 2h 27m into the drive.
The longest continuous stretch on this route runs about 148.8 miles.
This is a comfortable same-day trip.
Departure
Before you leave
Start with fuel, water, and navigation already sorted so the first hour feels easy.
First stop
Around 50 miles or 1h 7m in
Use this first pause for coffee, a restroom break, and a quick traffic check ahead.
Halfway reset
Around 114 miles or 2h 27m in
This is the best place for your longest stop, a real meal, and a full fuel check.
Final approach
Final hour starts around 3h 48m
Traffic, exits, and arrival timing usually matter more near Seattle, WA than in the middle of the route.
Before You Leave
+
Open the route before leaving Grand Coulee, WA so your first major turns are already loaded.
+
Leave with enough water and a charging cable within reach, not packed away.
+
Check your fuel range against the first long segment, especially if you are starting outside city service areas.
Day 1
Settle into the route from Grand Coulee, WA
This is one driving day of about 228 miles and 4h 35m.
Your first comfortable stop window is around 50 miles from Grand Coulee, WA.
This route can stay practical as a one-day drive if traffic stays reasonable.
Plan about 1 real break rather than only quick fuel stops.
The longest stretch is on I 90 for about 148.8 miles.
Where to Stop
Rest stops, refuel points, and overnight suggestions along this route.
Place data sourced from public business listings. Hours and availability may vary.
Heads-up: tricky spots
5 of 14
5 decision points cluster between mile 77.8 and 227.8 — GPS handles the exact turns, but know they're coming. Your lane choice matters more than the turn itself.
5
77.8 mi into trip|~1h 47m in|I 90
Merge onto I 90
Merge point - match speed before joining. Lane positioning matters here
Use the straight / slight right lanes.
8
226.6 mi into trip|~4h 31m in
Take the exit toward I 5 North: Vancouver British Columbia, James Street, Madison Street
Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one
Use the straight / slight right lanes.
Exit 2C
Toward I 5 North: Vancouver British Columbia, J...
6
227.3 mi into trip|~4h 33m in
Keep slight left at fork toward I 5 North: Vancouver British Columbia, Madison Street, Convention Center
Highway fork - watch signs carefully. Multiple destination signs - pick the right one
Toward I 5 North: Vancouver British Columbia, M...
8
227.5 mi into trip|~4h 33m in
Keep slight right at fork toward Madison Street, Convention Place
Highway fork - watch signs carefully. Lane positioning matters here. Multiple destination signs - pick the right one
Use the slight right lane.
Toward Madison Street, Convention Place
6
227.8 mi into trip|~4h 34m in|Madison Street
Turn left onto Madison Street
Lane positioning matters here
Use the left / straight lanes.
Fuel & Cost
Regular Gas
$44.42 one way
$88.83 round trip
$4.95/gal25.4 MPG avg80 kg CO2
Fuel Type
$/gal
One Way
Round Trip
midgrade
$5.18
$46.53
$93.07
premium
$5.39
$48.39
$96.78
diesel
$4.80
$43.05
$86.10
No toll roads detected on this route.
Estimated Trip Cost (one way, 1 person)
Fuel
$44
Meals
$25–$50
Total
$69–$94
Rough estimate based on US averages. Hotel $80–$140/night, meals $25–$50/day.
Estimated CO2 emission: 79.8 kg one way.
Prices: EIA weekly data, 2026-07-13.
Driving Electric?
About $24 in charging
· 0 stops
· 66% less CO2
Vehicle Type
kWh
Stops
DC Fast
Home Charge
Average EV
68.4
0
$23.94
$10.94
Efficient EV
57
0
$19.95
$9.12
EV Truck/SUV
91.2
1
$31.92
$14.59
Gas CO2
80 kg
EV CO2
27 kg (66% less)
Plan for 0 charging stops, roughly every 270 miles. Allow 25-40 minutes per stop at a DC fast charger.
DC fast charging avg $0.35/kWh. Home charging avg $0.16/kWh. US grid CO2: 0.39 kg/kWh.
Travel Intel
Current conditions at both ends of the drive.
Forecast as of Jul 18, 2026
Origin
Grand Coulee, WA
Morning
in Grand Coulee on Sunday
Local time
10:37 AM
PDT
Current temp
93°F
Sunny
SW 9 to 14 mph0% chanceLive forecast
Red Flag Warning
Red Flag Warning issued July 17 at 9:08PM PDT until July 18 at 9:00PM PDT by NWS Spokane WA
Red Flag Warning
Red Flag Warning issued July 17 at 9:08PM PDT until July 18 at 9:00PM PDT by NWS Spokane WA
Destination
Seattle, WA
Morning
in Seattle on Sunday
Local time
10:37 AM
PDT
Current temp
76°F
Mostly Sunny
WSW 2 to 7 mph1% chanceLive forecast
Red Flag Warning
Red Flag Warning issued July 17 at 9:08PM PDT until July 18 at 9:00PM PDT by NWS Spokane WA
Red Flag Warning
Red Flag Warning issued July 17 at 9:08PM PDT until July 18 at 9:00PM PDT by NWS Spokane WA
Seasonal Notes
Summer travel usually means heavier construction, hotter rest stops, and busier weekend traffic around major cities.
Winter travel shortens daylight, so a route that looks manageable on paper can feel much longer after dark.
Holiday weekends tend to make both departure and arrival windows slower than the raw route time suggests.
Time zone
Same local time
Origin and destination are on the same clock, so arrival timing is easier to judge at a glance.
Temperature spread
17 degrees cooler at arrival
A meaningful temperature swing is a good cue to rethink layers, water, and how soon you want to arrive.
Road read
4h 35m on the road
An early start around 7-8 AM gets you there with plenty of daylight left.
Weather data from the National Weather Service. Conditions may change; check closer to your travel date.
National Parks Near This Route
Worth a detour if your schedule allows.
Klondike Gold Rush - Seattle Unit National Historical Park
National Historical Park
Seattle flourished during and after the Klondike Gold Rush. Merchants supplied people from around the world passing through this port city on their way to a remarkable adventure in the Yukon Territory...
Park data from the National Park Service API. Alerts update every 2 hours.
More Details
What kind of drive is this?
You'll spend about 67% of your 228 miles on highways. The longest continuous stretch on a major highway is 148.8 miles on I 90. After the highway portion, you'll transition to surface roads for the remainder of the drive. Expect to notice the shift from highway cruising to more varied traffic and potentially more frequent intersections as you approach your destination.
67% highway — fuel and pacing are the main things to plan.
21 navigation steps total — most of the decisions cluster near the start and finish.
Longest single stretch: 148.8 mi on I 90.
How Hard Is This Drive?
5/10
This is a straightforward highway drive that stays mostly on I 90 and Coulee Boulevard. You will hit about 14 points where you need to pay attention to lane position or signs. The trickiest moment comes around 77.8 miles in near I 90.
Driving Effort5/10
Moderate - straightforward overall, but long enough or busy enough to require pacing
Balances navigation complexity with total wheel time.
This drive requires moderate attention. Across 228 miles you will encounter 14 spots where lane choice or exit timing matters. Not difficult for experienced highway drivers, but worth previewing the tricky sections before you go.
Where does it get tricky?
The main spots that need attention: at 77.8 miles (I 90): Merge point - match speed before joining. Lane positioning matters here; at 226.6 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 227.3 miles: Highway fork - watch signs carefully. Multiple destination signs - pick the right one.
Grand Coulee is a city in the Columbia River Plateau of Washington State. It is on the shore of Lake Roosevelt just above the Grand Coulee Dam, the largest hydroelectric power producer in the United States.
This guide includes the neighboring communities of Electric City and Coulee Dam.
Seattle, Washington sits at one of the most beautiful spots in the United States. Occupying a narrow isthmus between the Puget Sound and Lake Washington, it is the biggest city in the Pacific Northwest, with 780,000 people in Seattle and over four million people in the metro area. Seen from above, carpets of evergreen trees, pristine blue waters, and snowy white mountains surround the downtown's metallic skyscrapers, earning the city its nickname The Emerald City.
On the ground, you will find a vibrant and cosmopolitan city. Next to the progressive downtown and the freewheeling feel of Capitol Hill, you can find a laid-back atmosphere in the districts to the north and ethnically diverse neighborhoods to the south.
Top landmarks
•Space Needle — observation tower in Seattle, Washington, United States
•Climate Pledge Arena — sports arena in Seattle, Washington, USA
•Museum of Pop Culture — museum in Seattle, Washington, USA
Doable as a same-day drive at 4h 35m. Total distance: 228 miles.
Family Friendly
Moderate complexity with 1 natural rest stops along the way.
Solo Traveler
4h 35m drive, comfortable solo distance.
First-Time Driver
Mostly highway driving (67%). Some complex stretches to watch for.
Frequently Asked Questions
The longest stretch is about 148.8 miles on I 90. The full list of main roads is in the Roads section above.
Yes — we found about 10 rest areas or service plazas within a short detour of the route (from OpenStreetMap). See the Rest Stops tab under Nearby Places for locations and mile markers. Plan to stretch, use the bathroom, and top off fluids every 2–3 hours on longer drives.
Yes, with realistic expectations. Build in a stop roughly every 2 hours, have snacks and activities ready, and check the Nearby Places tabs for kid-friendly stops along the way.
The main spots that need attention: at 77.8 miles (I 90): Merge point - match speed before joining. Lane positioning matters here; at 226.6 miles: Exit ramp - move to the correct lane early. Lane positioning matters here. Multiple destination signs - pick the right one; at 227.3 miles: Highway fork - watch signs carefully. Multiple destination signs - pick the right one.
Yes — Klondike Gold Rush - Seattle Unit National Historical Park. See the National Parks section for detour distances and tips on detours.
Possible but tiring. At 4.6 hours each way, an in-and-out day trip would put you behind the wheel for 9.2 hours — manageable with a long break at Seattle, WA, but most travelers stay overnight.
